ASN Wikibase Occurrence # 153379
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Date: | Friday 6 March 1992 |
Time: | 11:30 |
Type: | Bell 214B-1 |
Owner/operator: | Rocky Mountain Helicopters |
Registration: | N314RM |
MSN: | 28041 |
Year of manufacture: | 1979 |
Total airframe hrs: | 8116 hours |
Fatalities: | Fatalities: 0 / Occupants: 2 |
Aircraft damage: | Substantial |
Category: | Accident |
Location: | Hobart Bay, AK -
United States of America
|
Phase: | Manoeuvring (airshow, firefighting, ag.ops.) |
Nature: | Cargo |
Departure airport: | |
Destination airport: | |
Investigating agency: | NTSB |
Confidence Rating: | Information is only available from news, social media or unofficial sources |
Narrative:THE HELICOPTER WAS HOVERING APPROX 200 FT ABOVE THE LOG WHICH WAS BEING ATTACHED TO THE CARGO HOOK. THE PILOTS HEARD A LOUD BANG FOLLOWED BY A LOSS OF ENGINE POWER.
THE HELICOPTER AUTOROTATED INTO STEEP UNEVEN TERRAIN, THE ONLY AREA AVAILABLE.
EXAMINATION OF THE ENGINE REVEALED FATIGUE FAILURE OF THE CENTRIFUGAL IMPELLER ENCOMPASSING A 60 DEG ARC. THIS SECTION SEPARATED FROM THE ENGINE AND HELICOPTER. ANALYSIS OF THE IMPELLER SHOWED THAT THE COOLING HOLES, ASSOCIATED ONLY WITH THE T5508D ENGINE, DID NOT HAVE THE PRESCRIBED RADIUS, AND CRACKS WERE FOUND EMANATING FROM THE OTHER COOLING HOLES.
PC: FATIGUE FAILURE OF THE COMPRESSOR ASSEMBLY IMPELLER, AND INADEQUATE QUALITY CONTROL BY THE MANUFACTURER. A FACTOR WHICH CONTRIBUTED TO THE ACCIDENT WAS THE MOUNTAINOUS/HILLY TERRAIN.
Sources:
World Directory of Airliner Crashes/Terry Denham
https://www.ntsb.gov/aviationquery/brief.aspx?ev_id=20001211X14191&key=1 Revision history:
Date/time | Contributor | Updates |
20-Feb-2013 07:09 |
TB |
Added |
21-Feb-2013 11:18 |
TB |
Updated [Total occupants, Nature, Source, Narrative] |
20-Aug-2014 21:30 |
Aerossurance |
Updated [Phase, Narrative] |
21-Dec-2016 19:28 |
ASN Update Bot |
Updated [Time, Damage, Category, Investigating agency] |
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